* {
    margin: 0px;
    padding: 0px;
    text-decoration: none;
}

a {
    color: black;
}

body {
    background-size: 100% 100%;
    background-image: url(../img/index.jpg);
    background-attachment: fixed;
}

#quotation {
    width: 800px;
    margin: auto;
    margin-top: 150px;
    text-align: center;
}

#welcome {
    color: rgb(195, 167, 41);
    animation: anim 3s;
    font-size: 100px;
}

#welcome2 {
    color: rgb(187, 159, 36);
    animation: anim 6s;
    font-size: 50px;
}

#welcome3 {
    color: rgb(78, 25, 226);
    animation: anim 9s;
    font-size: 120px;
    margin-bottom: 200px;
}

#welcome4 {
    color: white;
    animation: anim 11s;
    font-size: 20px;
}

@keyframes anim {
    0% {
        opacity: 0;
    }
    100% {
        opacity: 1;
    }
}

#navigation {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 2;
    list-style-type: none;
    overflow: hidden;
    background-color: #333;
}

#navigation li {
    float: right;
}

#navigation button {
    background-color: #333;
    border: none;
}

#navigation li a {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

#navigation li a:hover {
    background-color: #111;
}

#appName {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    background-color: rgb(159, 6, 151);
}


/*! 示例  */

#content {
    margin: auto;
    margin-top: 200px;
    color: white;
    width: 55rem;
}

.card-body {
    background-color: rgb(0, 0, 0, 0.5);
}

.card-body button {
    margin-top: 42px;
    margin-left: 5px;
}

#comment {
    background-color: rgb(34, 33, 33, 0.5);
}

#comment p {
    margin-left: 10px;
}

#comment button {
    margin-right: 6px;
    float: right;
}

#content p {
    margin-top: 10px;
}

.card {
    margin-top: 5px;
    border: #111;
}